Systems and methods for detecting transparent media in printers

ABSTRACT

A printer that includes systems for detecting transparent medium may include a medium dispenser for transporting print medium along a transport pathway to a print station which receives the print medium. Transmitters and receivers may be positioned on opposite sides of the transport pathway for scanning the print medium with a light beam. The sensor arrangement may be configured to detect deflection of the light beam when a transparent print medium is transported on the transport pathway between the transmitter and the receiver. The results of the scan may be communicated to a controller to facilitate proper print settings.

FIELD

The present invention relates to the field of printers and, morespecifically, to printer sensor systems and methods for detectingtransparent media in printers.

BACKGROUND

Printers can print specific information or content onto many differenttypes of print media (e.g., labels having a releasable liner). In orderto detect different types of print media and/or liner materials,printers (e.g., thermal-transfer printers) may include a sensorarrangement (e.g., optical sensors).

A typical printer sensor system, such as an optical sensor system, ismounted in a perpendicular arrangement with respect to the surface ofthe print media. The optical sensor detects print media type bymeasuring detected light values that are dependent upon the transparencyand/or reflectivity of the media and/or its liner (transmissive,reflective, etc.). The difference between the transparency reading ofthe combination of the print media and liner when compared to the lineralone enables the printer to, for example, detect the edges of the printmedia. If the type of print medium is not accurately detected, themedium may be misaligned and the content improperly printed (i.e., thecontent may be printed onto the liner rather than the label).

As described above, however, the typical printer optical sensor systemrequires that there be a detectable difference between the two detectedlight values (i.e., a different value for the print media and linerversus the liner alone) to detect the edges of the print media. As aresult, typical printers are unable to accurately detect transparentmedia on transparent liner without the addition of pre-printed marks, orsome other type of identification, in order to facilitate correctdetection and classification of the print media and/or print liner.Otherwise, a user may need to manually mark the transparent media ormake other manual changes to the printer configuration in order tocorrectly/accurately print onto the transparent media.

Therefore, a need exists for more effective printer systems, includingbut not limited to printer sensor systems that facilitate accuratedetection of transparent print media and/or print liner.

SUMMARY

Accordingly, in one aspect, the present invention embraces a system fordetecting transparent medium for use in a content applicator. The systemmay include a medium dispenser for transporting print medium along atransport pathway to a print station which receives the print medium.The system may also include a sensor arrangement positioned on oppositessides of the transport pathway for scanning the print medium, the sensorarrangement including a transmitter having an electromagnetic sourceconfigured to emit light, and a receiver to receive at least a portionof the light emitted. The sensor arrangement may be configured to detectdeflection of the light emitted when a transparent print medium istransported on the transport pathway between the transmitter and thereceiver.

In an exemplary embodiment, the transmitter may be a narrow light beamtransmitter.

In another exemplary embodiment, the light beam may be deflected as itpropagates through the transparent medium.

In yet another exemplary embodiment, the sensor arrangement may includephotodiodes.

In yet another exemplary embodiment, the receiver may be adjusted alongthe length of the transport pathway.

In yet another exemplary embodiment, the transparent medium may includetransparent plastic labels attached to a transparent releasable liner.

In yet another exemplary embodiment, the transmitter may be tilted at anangle with respect to the surface of the transparent medium.

In yet another exemplary embodiment, the transmitter may be tilted at a45° angle with respect to the surface of the transparent medium.

In another aspect, the present invention embraces a printer. The printermay include a print station having an opening for receiving print mediumtraveling along a transport pathway. The printer may also include amedium dispenser for transporting the print medium on the transportpathway to the print station. Further, the printer may include a sensorarrangement positioned along opposite sides of the transport pathway forscanning the print medium, the sensor arrangement including atransmitter having an electromagnetic source configured to emit a lightbeam, and a receiver to receive at least a portion of the light beam.Moreover, the printer may include a controller subsystem including acentral processing unit and memory in communication with the sensorarrangement. The sensor arrangement may be configured to detectdeflection of the light beam emitted when a transparent print medium istransported on the transport pathway between the transmitter and thereceiver.

In an exemplary embodiment, the transparent medium of the printer mayinclude transparent labels.

In another exemplary embodiment, the sensor arrangement of the printermay be configured to detect the leading edge of the transparent label.

In yet another exemplary embodiment, the controller subsystem may beconfigured to maintain proper registration of the print medium basedupon the detected position.

In yet another exemplary embodiment, the memory includes a registrationlogic program.

In yet another exemplary embodiment, the transmitter may be tilted at anangle between 0° and 90° with respect to surface of the transparentmedium.

In yet another exemplary embodiment, the printer may include an array ofreceivers positioned along the length of the print media.

In another aspect, the present invention embraces a method ofdetermining the presence of transparent medium in a printer. The methodmay include scanning a printer's medium transport pathway with atransmitter and receiver sensor arrangement that transmits a beam oflight across the transport pathway and onto the receiver; advancingtransparent print medium into the medium transport pathway; anddetecting if the beam of light has been deflected with the sensorarrangement.

In an exemplary embodiment, the method may include communicating theresults of the scan to a controller subsystem.

In another exemplary embodiment, the method may include adjusting therate at which the print medium is advanced through the transport pathwaybased upon the results of the scan.

In yet another exemplary embodiment, the method may include adjustingthe rate at which content is applied to the print medium at a printstation based upon the results of the scan.

The foregoing illustrative summary, as well as other exemplaryobjectives and/or advantages of the invention, and the manner in whichthe same are accomplished, are further explained within the followingdetailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graphical illustration depicting a prior art printer sensorarrangement.

FIG. 2 is a graphical illustration depicting light beam deflection asthe light moves between mediums having different densities.

FIG. 3 is a graphical illustration depicting certain components of anexemplary printer sensor arrangement according to the present inventionwith a print liner positioned between the sensors.

FIG. 4 is a graphical illustration depicting certain components of anexemplary printer sensor arrangement according to the present inventionwith print media and a liner positioned between the sensors.

FIG. 4A is a graphical illustration depicting certain components of anexemplary printer sensor arrangement according to the present inventionwith a receiver that can be moved along the print media length.

FIG. 4B is a graphical illustration depicting certain components of anexemplary printer sensor arrangement according to the present inventionwith an array of receivers positioned along the print media length.

FIG. 5 is a three-dimensional block diagram graphically depictingcertain components of another exemplary printer sensor arrangementaccording to the present invention.

FIG. 6 is a three-dimensional block diagram graphically depictingcertain components of yet another exemplary printer sensor arrangementaccording to the present invention.

FIG. 7 is a block diagram graphically depicting certain components of anexemplary content applicator according to the present invention.

FIG. 8 is a block diagram graphically depicting an exemplary controllersubsystem according to the present invention.

FIG. 9 is a graphical illustration depicting a perspective view of anexemplary printer that may include certain components according to thepresent invention.

DETAILED DESCRIPTION

Printers are able to print information on many different media types,and typically detect media through use of optical sensors which willreturn different light intensity values depending on the transparencyand/or reflectivity of the media and/or its liner. The differencebetween the transparency reading of the combination of the print mediaplus the print liner compared to the liner alone can enable the printerto detect the edges of the media. This arrangement, however, requiresthat there be a detectable difference between the two values.

FIG. 1 depicts components of a typical printer sensor arrangement 10with both the print media 13 and an attached liner 14 advanced betweenthe optical sensor arrangement 10. In this position, transmitter 11 isoriented perpendicular to the surface of transparent print media 13 andtransparent liner 14, with receiver 12 mounted opposite to thetransmitter 11. Because the print media 13 and liner 14 are transparent,full transmission of light beam 15 will occur, and the sensorarrangement 10 will not return different values when detecting thetransparency of the media 13 and/or its liner 14.

Exemplary embodiments according to the present invention improve thefunctionality of the typical printer sensor arrangement 10 of FIG. 1allowing for the detection of transparent media, which is a difficultmedia for the typical printer to properly detect without modification(e.g., adding markings to the print media to enable detection).

FIG. 2 is an illustration depicting how a light beam 21 is deflecteddifferently when it moves between two mediums of different density, forexample, from free air 22 into a transparent plastic print media 20. Theequation n1(sin θ1)=n2(sin θ2) (Snell's Law) governs this behavior oflight. Here n₁ is the refractive index of medium 1, in this example freeair 22, and n₂ is the refractive index of medium 2, in this exampletransparent plastic print media 20. Of note, when θ₁=0°, as is the casein the typical printer sensor arrangement 10 (FIG. 1) whentransmission-type optical sensors 11, 12 are mounted perpendicular tothe surface of the media 20 (i.e., 0°), θ₂=0° also such that there is nodeflection of light 21 but, instead, full transmission of all lightthrough the transparent media.

Exemplary embodiments of printer sensor arrangements according to thepresent invention can utilize light deflection for the purpose ofdetecting transparent print media and/or transparent liner as depictedin the sensor arrangement 100 of FIGS. 3 and 4A-B. FIG. 3 depicts atransparent liner 114 advanced between a sensor pair, specifically anarrow beam light transmitter 101 and a receiver 112 of the sensorarrangement 100. FIG. 4 depicts transparent media 113 and transparentliner 114 advanced between the transmitter 101 and the receiver 112 ofthe sensor arrangement 100.

The transmitter 101 and receiver 112 are used as a sensor pair and arerespectively positioned to be tilted at an angle (e.g., 45°) withrespect to the surface of the print medium (i.e., the transparent media113 and/or the transparent liner 114). The light beam 115 will thereforebe deflected as it travels through the print medium and between thesensor pair 101, 112. This behavior of the light beam 115 can beutilized for the purpose of detecting transparent media and/ortransparent liner. The sensor pairs 101, 112 may include electromagnetictransmitters 101 that emit electromagnetic radiation and electromagneticreceivers 112 to receive electromagnetic radiation.

The electromagnetic receiver 112 may include receivers such as lightsensitive diodes and charge-coupled devices (CCDs), among others. Insome embodiments, an arrangement of receivers 112 such as multiplephotodiodes or a CCD array may be associated with electromagnetictransmitters 101.

As illustrated in FIGS. 3 and 4, the light (i.e., electromagneticradiation) that will be received by the receiver 112 is different when atransparent liner 114 is interposed between the transmitter 101 andreceiver 112 compared to when a transparent media 113 and liner 114 arebetween the sensor pair 101, 112 due to the deflection of the light beam115. In this regard, the light 115 detected by the receiver 112 will beless in FIG. 4 when compared to FIG. 3. The arrangement of sensors maybe used to, for example, track the leading edge 120 and/or trailing edge121 of the transparent media 113 so that the print media 113 is properlyregistered for printing.

FIGS. 4A and 4B illustrate sensor arrangement embodiments similar to theembodiments illustrated in FIGS. 3 and 4, but which include certainadditional features that may be used to facilitate detection ofdifferent label/liner material combinations.

FIG. 4A depicts a transparent media/label 113A and transparent liner114A advanced between a transmitter 101A and receiver 112A of the sensorarrangement 100A. The light beam 115A is deflected as it travels throughthe print medium and between the sensor pair 101A, 112A.

Light beam portion 116A (portion of beam shown as a dashed line),illustrates the deflected light beam 115A as if the light beam werepassing only through the liner 114A when the print media is advancedalong a transport pathway. As set forth above, there is a differentdiffraction angle for the light beam when passing through the respectiveprint media.

As shown by light beam portion 116A, for this exemplary label 113A andliner 114A combination the receiver 112A would not be able to receivethe light beam 116A when the light beam 115A is only passing through theprint liner 114A. Similarly, for certain other combinations (notexplicitly shown), the receiver 112A may detect the light beam 115A whenpassing through the liner 114A only but not when passing through thetransparent media 113A and liner 114A combination such that the sensorarrangement would be unable to detect the edges 120A, 121A of thetransparent media. As illustrated by arrows 117A, in the exemplaryembodiment illustrated at FIG. 4A the position of receiver 112A may beadjusted along the length of the print media to facilitate detection ofdifferent label/liner material combinations.

FIG. 4B illustrates another exemplary embodiment which can facilitatedetection of different label/liner material combinations. Referencesnumbers set forth in FIG. 4B correspond to the related referencesnumbers described in FIG. 4A. Additionally, FIG. 4B illustrates an arrayof receivers 112B_(N) whereby subscript N refers to the number ofreceivers included within the array. In this embodiment, the light beam115B, 1116B will be received by one of the receivers 112B_(N) withoutthe need to adjust the position of the receiver along the length of theprint media. Although illustrated as extending along the length of theprint media, the receiver array may extend along the media width aswell.

FIGS. 5 and 6 provide exemplary implementations of printer sensorarrangements 200, 300 according to the present invention. In FIGS. 5 and6, respectively, a narrow beam transmitter 201, 301 is located belowtransparent media 213, 313 and a transparent liner 214, 314. Acorresponding narrow beam receiver 212, 312 is located above thetransparent media 213, 313 and the transparent liner 214, 314. Thetransmitter/receiver pairs are tilted at an angle in relation to thesurface of the media 213, 313 and/or the liner 214, 314.

In the printer sensor arrangements 200 of FIG. 5 thetransmitter/receiver pair 201, 212 is offset about the x-axis asillustrated in the three-dimensional coordinate system. In the printersensor arrangements 300 of FIG. 6 the transmitter/receiver pair 301, 312is offset about the y-axis as illustrated in the three-dimensionalcoordinate system.

FIG. 7 depicts certain components of an exemplary content applicator 150that may utilize an embodiment of the sensor arrangement (e.g., sensorarrangement 100 of FIG. 3) of the present invention. In someembodiments, the content applicator 150 may embrace a printer (e.g., inkjet printer, dot matrix printer, impact printer, laser printer, or athermal printer).

The content applicator 150 may include a sensor arrangement 100, a printstation 160 (which may include, for example, a print head), a printmedium dispenser 170 (e.g., a spindle/roller), and a controllersubsystem 180. The print medium 190 includes a number of transparentmedia 113 and a transparent releasable liner 114. The media 113 may beadhered to the liner 114 by adhesive such as, for example, a pressuresensitive adhesive layer.

The sensor arrangement 100 scans the medium 190 as the medium 190 passesalong a transport pathway. In some embodiments, the sensor arrangement100 may be implemented as depicted at FIGS. 5 and 6 reference numbers200, 300. The sensor arrangement 100 provides the controller subsystem180 with medium 190 scan information.

In some embodiments, the sensor arrangement 100 may be used to determinethat transparent medium 190 is present, and the location of the leadingedge and/or the location of the trailing edge of the print media 113(e.g., the leading and trailing edge of a label). Specifically, a changein the detected electromagnetic radiation may be used to facilitatecorrect printing (e.g., correct advancement, correct print settings,etc.) depending upon whether the light beam was propagated through therelease liner 114 or whether the electromagnetic radiation waspropagated through the release liner 114 and one of the transparentmedia 113.

FIG. 8 shows an exemplary embodiment of a controller subsystem 180. Thecontroller subsystem 180 may include a processor 181, a memory 182, oneor more digital signal processors 183, and a bus 184 which connects therespective subsystem 180 components. The signal processors 183 receiveanalog signals from the sensors of sensor arrangement 100 (e.g., usingdirect connection, or wireless communication protocols) and providedigital output, which corresponds to the received analog signals, to theprocessor 181.

The controller subsystem 180 may maintain proper registration of theprint medium 190 by, for example, adjusting the rate at which the medium190 passes through the content applicator 150 to match the desired ratethat content is applied to media 113 at the print station 160 based uponthe detected position of the media 113 on the liner 114.

In this regard, the memory 182 may include scan reference profiles thatmatch to the detected type of print medium 190 and that can be used bythe processor 181 to, among other things, determine and maintain properregistration of the medium 190.

In some embodiments, the memory 182 may include application programssuch as a registration logic. The medium registration logic may include,among other things, logic that when executed by the processor 181 may beused to generate a scan profile for the media 113 of the continuousmedium 190. The scan profiles can be used to determine the location ofthe media 113 based upon the signals from the digital signal processors183.

FIG. 9 depict an exemplary printer, specifically a bar code labelthermal printer, which may include certain components (e.g., thecomponents of content applicator 150) according to the presentinvention.

To supplement the present disclosure, this application incorporatesentirely by reference the following patents, patent applicationpublications, and patent applications:

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In the specification and/or figures, typical embodiments andenvironments of the invention have been disclosed. The present inventionis not limited to such exemplary embodiments. The use of the term“and/or” includes any and all combinations of one or more of theassociated listed items. The figures are schematic representations andso are not necessarily drawn to scale. Unless otherwise noted, specificterms have been used in a generic and descriptive sense and not forpurposes of limitation.

The invention claimed is:
 1. A system for detecting transparent medium,comprising: a medium dispenser for transporting print medium along atransport pathway to a print station which receives the print medium;and a sensor arrangement for scanning the print medium, the sensorarrangement including (i) a transmitter having an electromagnetic sourceconfigured to emit light toward a first surface of the print medium, and(ii) a receiver positioned about a second surface of the print mediumopposite the first surface, and configured to receive at least a portionof the light emitted from the transmitter; wherein the sensorarrangement is configured to detect deflection of the light emitted whena transparent print medium is transported on the transport pathway andthe transparent print medium is interposed between the transmitter andthe receiver; and wherein the deflection is based, at least in part,upon the transparent print medium's refractive index.
 2. The systemaccording to claim 1, wherein the transmitter is a narrow light beamtransmitter.
 3. The system according to claim 2, wherein the light beamis deflected as it propagates through the transparent medium.
 4. Thesystem according to claim 1, wherein the sensor arrangement comprisesphotodiodes.
 5. The system according to claim 1, wherein the receiver isconfigured to be adjusted along the transport pathway.
 6. The systemaccording to claim 1, wherein the transparent medium comprisestransparent plastic labels attached to a transparent releasable liner.7. The system according to claim 1, wherein the transmitter is tilted atan angle with respect to the surface of the transparent medium.
 8. Thesystem according to claim 7, where the angle is 45°.
 9. A printer,comprising: a print station having an opening for receiving print mediumtraveling along a transport pathway; a medium dispenser for transportingthe print medium on the transport pathway to the print station; a sensorarrangement for scanning the print medium, the sensor arrangementincluding (i) a transmitter having an electromagnetic source configuredto emit a light beam toward a first surface of the print medium, and(ii) a receiver positioned about a second surface of the print mediumopposite the first surface, and configured to receive at least a portionof the light beam from the transmitter; and a controller subsystemcomprising a central processing unit and memory in communication withthe sensor arrangement; wherein the sensor arrangement is configured todetect deflection of the light beam emitted when a transparent printmedium is transported on the transport pathway and the transparent printmedium is interposed between the transmitter and the receiver; andwherein the deflection is based, at least in part, upon the transparentprint medium's refractive index.
 10. The printer according to claim 9,wherein the transparent medium comprises transparent labels.
 11. Theprinter according to claim 10, wherein the sensor arrangement isconfigured to detect the leading edge of the transparent label.
 12. Theprinter according to claim 11, wherein the controller subsystem isconfigured to maintain proper registration of the print medium basedupon the detected position.
 13. The printer according to claim 12,wherein the memory includes a registration logic program.
 14. Theprinter according to claim 9, wherein the transmitter is tilted at anangle between 0° and 90° with respect to surface of the transparentmedium.
 15. The printer according to claim 9, comprising an array ofreceivers positioned along the transport pathway.
 16. A method ofdetermining the presence of transparent medium in a printer, comprising:advancing transparent print medium into a medium transport pathway;emitting light toward a first surface of the transparent print mediumwith a transmitter; receiving light emitted from the transmitter with areceiver positioned about a second surface of the transparent printmedium opposite the first surface; and detecting, when the transparentprint medium is transported on the transport pathway and the transparentprint medium is interposed between the transmitter and the receiver, ifthe beam of light has been deflected with the transmitter and receiversensor arrangement; wherein the deflection is based, at least in part,upon the transparent print medium's refractive index.
 17. The method ofclaim 16, further comprising: communicating the results of the detectionto a controller subsystem.
 18. The method of claim 17, furthercomprising: adjusting the rate at which the print medium is advancedthrough the transport pathway based upon the results of the detection.19. The method of claim 17, further comprising: adjusting the rate atwhich content is applied to the print medium at a print station basedupon the results of the detection.